Dependency of dynamic interlaminar shear strength of composites on test technique used

H. L. Gowtham, Jayaram R. Pothnis, G. Ravikumar, N. K. Naik

Research output: Contribution to journalArticlepeer-review

Abstract

Studies are presented on dependency of dynamic interlaminar shear (ILS) strength on the experimental technique used for a typical plain weave E-glass/epoxy composite. Dynamic ILS strength was determined based on two experimental techniques, namely torsional split Hopkinson bar (TSHB) apparatus using thin walled tubular specimens and compressive split Hopkinson pressure bar (SHPB) apparatus using single lap specimens. The results obtained from these techniques are compared. In general, it is observed that dynamic ILS strength for composites obtained by TSHB testing using thin walled tubular specimens is lower than the dynamic ILS strength obtained using single lap specimens in compressive SHPB. The issues involved in TSHB testing of thin walled tubular specimens made of composites are discussed and the reasons for reduced dynamic ILS strength using thin walled tubular specimens are highlighted. Finite element analysis (FEA) of thin walled tubular specimens made of composite and resin subjected to quasi-static torsional loading is presented. Using FEA results, the reasons for lower ILS strength of composite thin walled tubular specimens are substantiated.

Original languageEnglish
Pages (from-to)151-159
Number of pages9
JournalPolymer Testing
Volume42
DOIs
Publication statusPublished - Apr 2015
Externally publishedYes

Keywords

  • Finite element analysis
  • High strain rate testing
  • Interlaminar shear strength
  • Single lap specimen
  • Thin walled tubular specimen

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